不同质地的坪床对土壤物理性状及草坪质量的影响

Impact of turf beds with different soil texture on the soil physical properties and quality of Bermuda turf

以暖季型草坪草杂交狗牙根品种百慕大T-419建植草坪，以南京地区优势资源“长江水洗沙”（包括粗沙和细沙）与本地田园土组合配比为坪床基质，测定土壤容重、总孔隙度、入渗率以及含水量等指标，分析不同质地土壤物理性状差异，结合草坪质量综合评判，筛选出适宜的坪床配比。结果表明：（1）高含沙量的坪床土壤容重显著高于全土对照，土壤总孔隙度显著低于全土对照，随着滚压次数的增加，各处理间的土壤容重逐渐表现出差异性，土壤总孔隙度显著降低，进而使土壤的通气性得到了改善，其中50％～75o,4的含沙量的处理改善效果最好；（2）土壤稳定入渗率随着含沙量的增加而逐渐增大，而土壤持水性随着含沙量的增加而逐渐降低，其中50％～75％含沙量的处理既符合国际上普遍接受的渗透率标准，又具有相对较好的保水保肥能力；（3）随着含沙量的增加，草坪质量呈先上升后下降的趋势，其中以50％含沙量的处理草坪质量表现最好，其次为25％粗沙含量和75％细沙含量的处理。

The advantage resource, Yangtze River washed sand （including coarse sand and fine sand） in Nanjing,was used with the local garden soil as the turf bed materials to screening the proper turf bed formula through measuring soil density,total porosity,infiltration rate and soil water content. The results showed that （1） the bulk density of high sand content was significantly higher than the control, but total porosity was signif- icantly lower,with the increase of pressing with field roller,the bulk density among treatments appeared differ- ent gradually and the total porosity was significantly lower,then soil aeration was improved,in which, the best sand content i was from 50 % to 75 %; （2） the soil stable infiltration increased and the water capacity decreased gradually with the sand content increasing. The best sand content was from 50% to 75% because it not only met the generally accepted international permeability standard, but also performed relatively better capacity for holding water and soil nutrients; （3） the turf quality tended to raise first and then declined as the sand content increasing,50% of sand content performed the best and it was followed by the formula of 25% coarse sand ＋ 75% fine sand.